AOB is the diameter of the circle (centre O) and C is a point on the circle such that AC = BC. Then ∠CAB is:

Eight equidistant points lie on a circle. Using these points as vertices, right angled triangles are drawn such that one side of each triangle is diameter of the circle. The number of such possible r…

If the perimeter and the area of a circle are numerically equal, then the radius of the circle is

The circumference of a circle exceeds the diameter by 16.8 cm. What is the diameter of the circle? (Take π = 22/7)

Two circles touch internally. The sum of their areas is 116π sq. cm and the distance between their centres is 6 cm. The radii of the circles are respectively

The diameter of a sphere made of copper is 3 cm. The sphere is melted and recast into a wire. If the length of the wire is half metre, then what is the diameter of the wire?